环肥燕瘦~~也说说吧

来源: Bluebell 于 2013-04-19 13:56:06 [档案] [博客] [旧帖] [给我悄悄话] 阅读数 : (4346 bytes)

本帖于 2013-04-23 22:01:40 时间, 由普通用户罗曼编辑

正经说个BMI与寿命的关系吧。我昨天才看到的，很吃惊，因为彻底颠覆了我以往的观念。

美国，加拿大各自独立做的一项长达12年之久的随访研究。

研究发现太瘦的人和太胖的人的寿命都比正常体重的人要短。这个很好理解，因为太瘦太胖营养都不好，身体发生疾病的风险都大。

意外的是研究发现，overweight vs normal weight 来说，overweight的人寿命比normal weight 要长。这点，两国的独立研究彼此相证实。

研究者进而解释说，这项研究虽然控制了年龄，种族，性别等等可以预见的混杂因素，但不能控制生活质量这个重要问题。活的长不代表活的健康活的好。所以，呼吁人们要正确看待BMI，不要单纯去追求体重计上的数字。BMI高，也有可能是肌肉发达的原因，因为肌肉重量远高于脂肪的重量。

wiki上有个survival parodox的概念，是说，对于那些有心脏疾病的人来说，BMI 30-34.9 的人比正常体重的人死亡率要低，原因是反反复复减肥的人更容易得病。而适度的脂肪对健康有保护作用。

但是当一个人，LDL TG 都高的时候，就算是BMI再正常，也是有必要控制体重的。

假如配偶在这个时候还跟你说什么手感啊媚态啊不要减吧，这样的不负责任的配偶不要也罢。

我个人崇尚科学胜于文学。

原文附录如下，仅供有心人参考。

wiki~~~
although the negative health consequences of obesity in the general
population are well supported by the available evidence, health outcomes in
certain subgroups seem to be improved at an increased BMI, a phenomenon
known as the obesity survival paradox.[56] The paradox was first described
in 1999 in overweight and obese people undergoing hemodialysis,[56] and has
subsequently been found in those with heart failure and peripheral artery
disease (PAD).[57]

In people with heart failure, those with a BMI between 30.0 and 34.9 had
lower mortality than those with a normal weight. This has been attributed to
the fact that people often lose weight as they become progressively more
ill.[58] Similar findings have been made in other types of heart disease.
People with class I obesity and heart disease do not have greater rates of
further heart problems than people of normal weight who also have heart
disease. In people with greater degrees of obesity, however, the risk of
further cardiovascular events is increased.[59][60] Even after cardiac
bypass surgery, no increase in mortality is seen in the overweight and obese
.[61] One study found that the improved survival could be explained by the
more aggressive treatment obese people receive after a cardiac event.[62]
Another found that if one takes into account chronic obstructive pulmonary
disease (COPD) in those with PAD, the benefit of obesity no longer exists.[

ScienceDaily~~

The study examined the relationship between body mass index and death among
11,326 adults in Canada over a 12-year period. (BMI uses height and weight
to estimate body fat.) Researchers found that underweight people had the
highest risk of dying, and the extremely obese had the second highest risk.
Overweight people had a lower risk of dying than those of normal weight.

"It's not surprising that extreme underweight and extreme obesity increase
the risk of dying, but it is surprising that carrying a little extra weight
may give people a longevity advantage"

"It may be that a few extra pounds actually protect older people as their
health declines, but that doesn't mean that people in the normal weight
range should try to put on a few pounds,"

"Our study only looked at mortality, not at quality of life, and there are
many negative health consequences associated with obesity, including high
blood pressure, high cholesterol, and diabetes."

"Good health is more than a BMI or a number on a scale. We know that people
who choose a healthy lifestyle enjoy better health: good food choices, being
physically active everyday, managing stress, and keeping blood pressure,
cholesterol, and blood sugar levels in check,"